Specifications: Working voltage:12-24V Measurement range:6-30V Material:ABS Round Diameter: about 2.6cm Display Type:Digital display LED Color:Red / Blue / Green Features: 1.Universal for: Motorbike Car / Boat / ATV / UTV / Camper / Caravans / Travel Trailer etc. 2.It works for 12V-24V. Easy to install,work great for checking Voltage. 3.Mounts in a 1-1/8"hole in panels up, 0.25"thick, a nylon retaining nut holds the meter in place. 4.The state of your battery between full charged and discharged. 5.The meter has easy to read LED segments and connect to your 12 volt system. 6.Used to monitor the storage-battery voltage, with reverse connection protection function, line will not be burnt. 7.Timely grasp the state of battery voltage, voltage measurement purposes can also be used for other products. Package List: 1* Voltmeter 2*Blue terminals Note: This v oltmeter"'"s margin of error is around 0.2V.